<template>
  <div>
    <!-- 评论列表 -->
    <div
      class="cmt-list"
      :class="isShowCmtInput ? 'art-cmt-container-2' : 'art-cmt-container-1'"
    >
      <!-- 评论的 Item 项 -->
      <van-list
        v-model="loading"
        :finished="finished"
        finished-text="没有更多了"
        @load="onLoad"
        offset="50"
        :immediate-check="false"
      >
        <div class="cmt-item" v-for="obj in commentList" :key="obj.com_id">
          <!-- 头部区域 -->
          <div class="cmt-header">
            <!-- 头部左侧 -->
            <div class="cmt-header-left">
              <img :src="obj.aut_photo" alt="" class="avatar" />
              <span class="uname">{{ obj.aut_name }}</span>
            </div>
            <!-- 头部右侧 -->
            <div class="cmt-header-right">
              <van-icon
                name="like"
                size="16"
                color="red"
                v-if="obj.is_liking === true"
                @click="likeFn(true, obj)"
              />
              <van-icon
                name="like-o"
                size="16"
                color="gray"
                v-else
                @click="likeFn(false, obj)"
              />
            </div>
          </div>
          <!-- 主体区域 -->
          <div class="cmt-body">
            {{ obj.content }}
          </div>
          <!-- 尾部区域 -->
          <van-button
            round
            size="mini"
            color="#ccc"
            type="primary"
            @click="showPopup"
            >回复 ></van-button
          >
          <div class="cmt-footer">{{ formatDate(obj.pubdate) }}</div>
          <!-- <van-popup
            v-model="show"
            position="right"
            close-on-popstate="true"
            class="edit_wrap">
      <channel-edit
      @closePE="closePE"
      :src="obj.aut_photo"
      :uname="obj.aut_name"
      :body="obj.content"
      :timer="formatDate(obj.pubdate)"

      ></channel-edit></van-popup> -->
        </div>
      </van-list>
    </div>
    <!-- 底部添加评论区域 - 1 -->
    <div class="add-cmt-box van-hairline--top" v-if="isShowCmtInput === false">
      <van-icon name="arrow-left" size="0.48rem" @click="$router.back()" />
      <div class="ipt-cmt-div" @click="changeShowFn">发表评论</div>
      <div class="icon-box">
        <van-badge :content="totalCount" :max="99">
          <van-icon @click="moveFn" name="comment-o" size="0.53333334rem" />
        </van-badge>
        <van-icon name="star-o" size="0.53333334rem" />
        <van-icon name="share-o" size="0.53333334rem" />
      </div>
    </div>

    <!-- 底部添加评论区域 - 2 -->
    <div class="cmt-box van-hairline--top" v-else>
      <textarea
        v-fofo
        v-model="comValue"
        placeholder="友善评论、理性发言、阳光心灵"
        @blur="blurFn"
      ></textarea>
      <van-button type="default" :disabled="comValue.length === 0" @click="send"
        >发布</van-button
      >
    </div>
    <!-- 右侧评论回复--弹出层 -->

  </div>
</template>

<script>
import {
  getCommentsListAPI,
  sendCommentAPI,
  likeCommentAPI,
  unLikeCommentAPI
} from '@/api'
import dayjs from 'dayjs'
import 'dayjs/locale/zh-cn' // import locale
import * as relativeTime from 'dayjs/plugin/relativeTime' // use locale
// import ChannelEdit from './ChannelEdit.vue'
dayjs.extend(relativeTime)
dayjs.locale('zh-cn')
export default {
  // components: {
  //   ChannelEdit
  // },
  props: {
    artId: [Number, String]
  },
  data () {
    return {
      commentList: [], // 评论数组
      isShowCmtInput: false,
      totalCount: 0, // 评论总数
      comValue: '', // 评论内容
      loading: false, // 底部加载状态
      finished: false, // 底部是否加载完成
      offset: null, // 下一页(偏移id), 一定初始值null(第一页不需要传, axios遇到null忽略此参数)
      show: false,
      comid: '' // 评论id
    }
  },
  methods: {
    // 格式化多久之前
    formatDate (dateStr) {
      var a = dayjs()
      var b = dayjs(dateStr)
      const c = a.to(b) // 2 years ago
      return c
    },
    // 评论点赞功能
    async likeFn (bool, obj) {
      if (bool === true) {
        await unLikeCommentAPI(obj.com_id)
        obj.is_liking = false
      } else {
        await likeCommentAPI(obj.com_id)
        obj.is_liking = true
      }
    },
    // 点击发表评论-> 输入框出现
    changeShowFn () {
      this.isShowCmtInput = true
      // 用JS代码, 模拟一下滚动效果, 不让高的挡住最后一个评论的内容
      this.$nextTick(() => {
        // window.scrollTo(x轴坐标, y轴坐标)
        console.log(document.documentElement.scrollHeight)
        console.log(window.innerHeight)
        window.scrollTo(
          0,
          document.documentElement.scrollHeight - window.innerHeight
        )
      })
    },
    // 点击徽标滑动视口
    moveFn () {
      // 公式: 直接获取某个标签, 调用scrollIntoView() 它此标签自动滚入到网页最上边
      // 如果底部没有更多标签, 尽可能的往上滚动 (文章特别长, 无评论可以测试)
      document.querySelector('.like-box').scrollIntoView({
        behavior: 'smooth'
      })
    },
    // 发布评论框失去焦点事件
    blurFn () {
      // 定时器异步代码,让代码优先级最低最后执行,避免提前销毁dom标签
      setTimeout(() => {
        this.isShowCmtInput = false
      })
    },
    // 发布事件
    async send () {
      const res = await sendCommentAPI({
        target: this.artId,
        content: this.comValue
      })
      this.commentList.unshift(res.data.data.new_obj)

      // 数量+1
      this.totalCount++
      // 成功后, 清除输入框内容
      this.comValue = ''
      // 视口上划到评论顶部
      document.querySelector('.like-box').scrollIntoView({
        behavior: 'smooth'
      })
    },
    async getCommentListFn () {
      const res = await getCommentsListAPI({
        artId: this.artId,
        offset: this.offset // 把offset偏移量带给后台
      })
      console.log(res)
      // 判断是否还有数据
      if (res.data.data.results.length === 0) {
        this.finished = true
      }
      this.commentList = [...this.commentList, ...res.data.data.results] // 合并数据
      // console.log('评论', res)
      // this.commentList = res.data.data.results
      this.totalCount = res.data.data.total_count || '' // 如果无评论则给空字符串(防止0徽标出现)
      this.offset = res.data.data.last_id // 保存起来为了做分页
      this.comid = res.data.data.results.com_id // 保存起来为了做分页
      // 关闭加载状态
      this.loading = false
    },
    // 加载更多
    onLoad () {
      if (this.commentList.length > 0) {
        // 防止网页刚打开, 上来走created, 再走onLoad的请求
        this.getCommentListFn()
      }
    },
    // 展示弹出层
    showPopup () {
      this.show = true
    },
    // 关闭弹层时间
    closePE (bool) {
      this.show = bool
    }
  },
  async created () {
    this.getCommentListFn()
  }
}
</script>

<style scoped lang="less">
.cmt-list {
  padding: 10px;
  .cmt-item {
    padding: 15px 0;
    + .cmt-item {
      border-top: 1px solid #f8f8f8;
    }
    .cmt-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      .cmt-header-left {
        display: flex;
        align-items: center;
        .avatar {
          width: 40px;
          height: 40px;
          background-color: #f8f8f8;
          border-radius: 50%;
          margin-right: 15px;
        }
        .uname {
          font-size: 12px;
        }
      }
    }
    .cmt-body {
      font-size: 14px;
      line-height: 28px;
      text-indent: 2em;
      margin-top: 6px;
      word-break: break-all;
    }
    .cmt-footer {
      margin-left: 25px;
      display: inline-block;
      font-size: 12px;
      color: gray;
      margin-top: 10px;
    }
  }
}

/*美化 - 文章详情 - 底部的评论页面 */
// 外层容器
.art-cmt-container-1 {
  padding-bottom: 46px;
}
.art-cmt-container-2 {
  padding-bottom: 80px;
}

// 发布评论的盒子 - 1
.add-cmt-box {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  box-sizing: border-box;
  background-color: white;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 46px;
  line-height: 46px;
  padding-left: 10px;
  .ipt-cmt-div {
    flex: 1;
    border: 1px solid #efefef;
    border-radius: 15px;
    height: 30px;
    font-size: 12px;
    line-height: 30px;
    padding-left: 15px;
    margin-left: 10px;
    background-color: #f8f8f8;
  }
  .icon-box {
    width: 40%;
    display: flex;
    justify-content: space-evenly;
    line-height: 0;
  }
}

.child {
  width: 20px;
  height: 20px;
  background: #f2f3f5;
}

// 发布评论的盒子 - 2
.cmt-box {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 80px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  padding-left: 10px;
  box-sizing: border-box;
  background-color: white;
  textarea {
    flex: 1;
    height: 66%;
    border: 1px solid #efefef;
    background-color: #f8f8f8;
    resize: none;
    border-radius: 6px;
    padding: 5px;
  }
  .van-button {
    height: 100%;
    border: none;
  }
}
// 控制弹出层大小
.edit_wrap {
  width: 100%;
  height: 100%;
}
</style>
